Well packer



June 24, 1941.

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C. W. FISHER 'WELL `PACKFR Filed Aug. 25, 1959 mvENToR Patented June 24, 194i #uNiTEo STATES PATENT OFFICE TELL PACKER Charles W. Fisher, Coeyville, Kans., assigner to Robinson Packer Company, Tulsa., Okla.Y

Application August 25, 1939, serial No. 291,974 claims. (Cl. 16s- 10) The invention relates to oil well packersof the expansible sleeve type, and has for its object to provide a device of this' character wherein the packer sleeve may be -positioned adjacent the bottom. of the well and expanded into engagement with the Wall of the well While in a stationary position, thereby preventing damage to the packer sleeve incident to the dragging on the wall of the well during the expanding operation,

which is now the difficulty with packer sleeves at.

present in use. y

A further object is to provide a shoe on the bottom of the well casing and adapted to rest on the bottom of the well and to receive there around the packer Sleeve and a tapered sleeve slidably connected to the shoe above the packer sleeve and adapted to be forced into the chamber of the packer sleeve for expanding the packer sleeve into engagement with the wall of the well and without an axial movement of the packer sleeve during the expanding operation.

A further object is toprovide a slidable connection between the tapered mandrel and the cylindrical portion of the shoe, and which slidable connection also forms jarring means during the pullout operation of the packer sleeve.

A further object is to provide a packer sleeve wherein the packer sleeve is expanded when it reaches its limit of downward movement in the well from the upper side thereof, thereby obviating dragging of the packer sleeve over the well wall during the expanding operation, which is now the common difliculty with bottom expanded packer sleeves in general use.

With the above and other objects in View the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, described and claimed, it being understood that changes in the precise embodiment of the invention may be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawing:

Figure lis a transverse sectional View through the lower end of a well and casing, showing the packer expanding device applied thereto.

Figure 2 is a View similar to Figure 1 but showing the packer sleeve expanded.

Figure 3 is an enlarged detail sectional View through one side of the packer expanding device.

The present invention is an improvement on Patent No. 1,749,033 issued to me March 4, 1930, and is designed to overcome the damaging of the packer and loss of efficiency thereof, incident to the packer being forced downwardly over the expanding mandrel during the expanding operation, and While in engagement. -with the wall of the well. In the present device the tapered expanding mandrel is carried by the casing above the shoe and does not startthe packer expanding operation until the shoe is resting on the bottom of the Well and the packer is in flnallstationary position, thereby obviating of the dragging of the packer axially while in engagement with the well Wall.

Referring to the drawing, the numeral I designates a conventional form of oil well and 2 the bottom thereof. Extending axially downwardly into the well is the casing 3 of conventional construction, and which casing has connected thereto, by means of a threaded sleeve 4, the expanding mandrel 5, the lower end of which is tapered as at 6. Telescopically movable within the expanding mandrel 5 is a shoe sleeve l, on the lower end of which is threaded the shoe 8 which rests on the bottom of the well when the casing is lowered into the well as shown in Figure 1. The upper end of the shoe sleeve l is provided with an annular flange 9 within the mandrel, and which ilange cooperates with a flange I0 carried by the mandrel 5 for limiting the outward movement of the shoe and sleeve. These shoulders also form means for imparting a jarring action on the parts during a pull out operation.

A packer sleeve H is disposed on the shoe sleeve 'l as shown in Figure 1,` and which sleeve is adapted to be expanded by the mandrel 5 into engagement with the well wall when the shoe 8 reaches the bottom of the well and the mandrel 5 is forced into the chamber of the packer sleeve by the continued downward movement of the mandrel and the casing, therefore it will be seen that the packer sleeve is in a stationary position in relation to the bottom 2 of the well,

consequently the packer Sleeve is not dragged over the Wall of the well and damaged thereby rendering the packing ineicient. Figure l shows the parts at the starting of the expanding operation; while Figure 2' shows the packer at the end of the expanding operation and in compacted engagement with the Wall of the well. During the entire expanding operation the packer sleeve remains stationary in relation to the bottom 2 of the well, consequently is not dragged over the irregular well wall surface, as in the case where the expanding mandrel is disposed below the packing ring and the packing ring is forced over the mandrel. A soft metal ring l2 is interposed between the packer Il and the shoe 8, and when the mandrel reaches the extreme movement downwardly, during an expanding operation, a seal is formed between the telescoping members, thereby preventing leakage.

From the above it will be seen that a bottom hole packer is provided which can be positioned relatively close to the bottom of the well for obtaining the maximum results, and expanding means is provided for radially expanding the packer when it has assumed its predetermined position, and the packer will not be dragged over the wall surface of the well and damaged by the wall.

The invention having been set forth what is claimed as new and useful is:

1. A bottom hole packer comprising a lower hole bottom engaging shoe, an expansible packing sleeve surrounding said shoe and adapted to be expanded radially into engagement with the wall of a hole, an expanding mandrel telescopically movable downwardly into the sleeve con- -nected to the shoe, said expanding mandrel being disposed above the packing sleeve.

2. The combination with a bottom` hole packer comprising telescopically engaged members, an expansible packing sleeve surrounding one of said members, one of said members forming an expanding mandrel disposed above packer sleeve and adapted to be forced downwardly into the packer sleeve when the other member and the packer sleeve are stationary in relation to the bottom of a well.

vcarried by said shoe, an expansible packing member surrounding the upwardly extending member of the shoe, a downwardly movable expandying mandrel telescopically connected to the upwardly extending member above the packing member and adapted to enter and expand the packing member progressively from its upper end downwardly when in stationary position with the shoe resting on the bottom of the well and a soft metal packer interposed between the shoe and the\1ower end of the packer and in the path of the mandrel end.

5. A device as set forth in claim 3 including jarring flanges carried by the shoe sleeve and the mandrel, above the packing member.

CHARLES W. FISHER. 

